Implement MxDSBuffer constructor, match MxDSSource::FUN_100bffd0 (#235)

* Implement MxDSBuffer constructor, match FUN_100bffd0

* Match to 100%, minor style fixes

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>

LEGO1/mxdsbuffer.cpp

@@ -1,9 +1,21 @@
 #include "mxdsbuffer.h"
 
+DECOMP_SIZE_ASSERT(MxDSBuffer, 0x34);
+
 // OFFSET: LEGO1 0x100c6470
 MxDSBuffer::MxDSBuffer()
 {
-  // TODO
+  m_unk20 = 0;
+  m_pBuffer = NULL;
+  m_pIntoBuffer = NULL;
+  m_pIntoBuffer2 = NULL;
+  m_unk14 = 0;
+  m_unk18 = 0;
+  m_unk1c = 0;
+  m_writeOffset = 0;
+  m_bytesRemaining = 0;
+  m_mode = 2;
+  m_unk30 = 0;
 }
 
 // OFFSET: LEGO1 0x100c6530
@@ -11,3 +23,15 @@ MxDSBuffer::~MxDSBuffer()
 {
   // TODO
 }
+
+// OFFSET: LEGO1 0x100c6780
+MxResult MxDSBuffer::FUN_100c6780(void* p_buffer, MxU32 p_size)
+{
+  m_pBuffer = p_buffer;
+  m_pIntoBuffer = p_buffer;
+  m_pIntoBuffer2 = p_buffer;
+  m_bytesRemaining = p_size;
+  m_writeOffset = p_size;
+  m_mode = 2;
+  return SUCCESS;
+}

LEGO1/mxdsbuffer.h

@@ -12,9 +12,30 @@ class MxDSBuffer : public MxCore
   MxDSBuffer();
   virtual ~MxDSBuffer() override;
 
-private:
+  // OFFSET: LEGO1 0x100c6500
-  undefined m_unk08[0x2C];
+  inline virtual const char *ClassName() const override // vtable+0x0c
+  {
+    // 0x100f0568
+    return "MxDSBuffer";
+  }
 
+  MxResult FUN_100c6780(void* p_buffer, MxU32 p_size);
+
+  inline void* GetBuffer() { return m_pBuffer;}
+  inline MxU32 GetWriteOffset() { return m_writeOffset;}
+
+private:
+  void* m_pBuffer;
+  void* m_pIntoBuffer;
+  void* m_pIntoBuffer2;
+  undefined4 m_unk14;
+  undefined4 m_unk18;
+  undefined4 m_unk1c;
+  undefined2 m_unk20;
+  undefined4 m_mode;
+  MxU32 m_writeOffset;
+  MxU32 m_bytesRemaining;
+  undefined4 m_unk30;
 };
 
 #endif // MXDSBUFFER_H

LEGO1/mxdssource.cpp

@@ -1,10 +1,10 @@
 #include "mxdssource.h"
+#include "mxdsbuffer.h"
 
 // OFFSET: LEGO1 0x100bffd0
-void MxDSSource::FUN_100bffd0(void* p_unk)
+void MxDSSource::ReadToBuffer(MxDSBuffer* p_buffer)
 {
-  // TODO: Calls read, reading into a buffer somewhere in p_unk.
+  Read((unsigned char*)p_buffer->GetBuffer(), p_buffer->GetWriteOffset());
-  Read(NULL, 0);
 }
 
 // OFFSET: LEGO1 0x100bfff0

LEGO1/mxdssource.h

@@ -3,13 +3,15 @@
 
 #include "mxcore.h"
 
+class MxDSBuffer;
+
 // VTABLE 0x100dc8c8
 class MxDSSource : public MxCore
 {
 public:
   MxDSSource()
     : m_lengthInDWords(0)
-    , m_pBuffer(0)
+    , m_pBuffer(NULL)
     , m_position(-1)
   {}
 
@@ -28,7 +30,7 @@ class MxDSSource : public MxCore
 
   virtual MxLong Open(MxULong) = 0;
   virtual MxLong Close() = 0;
-  virtual void FUN_100bffd0(void* p_unk);
+  virtual void ReadToBuffer(MxDSBuffer* p_buffer);
   virtual MxResult Read(unsigned char *, MxULong) = 0;
   virtual MxLong Seek(MxLong, int) = 0;
   virtual MxULong GetBufferSize() = 0;